An auditorium has dimensions 10 m × 10^ m × 60 m. How many moles of air fill this volume at one atmosphere and 0°C?
a. 2.7 × 10^2
b. 2.7 × 10^4
c. 2.7 × 10^3
d. 2.7 × 10^5
e. 2.7 × 10^6
D
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Active galaxy radio lobes and jets contain magnetic fields
a. True b. False Indicate whether the statement is true or false
Find the force (magnitude and direction) exerted on an electron moving vertically upward at a speed of 
m/s by a horizontal magnetic field of 0.50 T directed north.
a. 
b. 
c. 
d. 
The stars stay in "fixed" positions on the celestial sphere because they
A) are all located at precisely the same distance from Earth. B) are so far away that our eyes don't notice their motions through space. C) remain stationary relative to our solar system in space. D) were given their names by ancient civilizations.
Suppose you live at latitude 20°N. Based on the given right ascensions and declinations, which of the following stars passes closest to your zenith on its daily path through your sky?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'